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CentOS 7.0 - man page for io_cancel (centos section 2)

IO_CANCEL(2)				      Linux Programmer's Manual 				 IO_CANCEL(2)

io_cancel - cancel an outstanding asynchronous I/O operation
#include <linux/aio_abi.h> /* Defines needed types */ int io_cancel(aio_context_t ctx_id, struct iocb *iocb, struct io_event *result); Note: There is no glibc wrapper for this system call; see NOTES.
The io_cancel() system call attempts to cancel an asynchronous I/O operation previously submitted with io_sub- mit(2). The iocb argument describes the operation to be canceled and the ctx_id argument is the AIO context to which the operation was submitted. If the operation is successfully canceled, the event will be copied into the memory pointed to by result without being placed into the completion queue.
On success, io_cancel() returns 0. For the failure return, see NOTES.
EAGAIN The iocb specified was not canceled. EFAULT One of the data structures points to invalid data. EINVAL The AIO context specified by ctx_id is invalid. ENOSYS io_cancel() is not implemented on this architecture.
The asynchronous I/O system calls first appeared in Linux 2.5.
io_cancel() is Linux-specific and should not be used in programs that are intended to be portable.
Glibc does not provide a wrapper function for this system call. You could invoke it using syscall(2). But instead, you probably want to use the io_cancel() wrapper function provided by libaio. Note that the libaio wrapper function uses a different type (io_context_t) for the ctx_id argument. Note also that the libaio wrapper does not follow the usual C library conventions for indicating errors: on error it returns a negated error number (the negative of one of the values listed in ERRORS). If the system call is invoked via syscall(2), then the return value follows the usual conventions for indicating an error: -1, with errno set to a (positive) value that indicates the error.
io_destroy(2), io_getevents(2), io_setup(2), io_submit(2), aio(7)
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at Linux 2013-04-10 IO_CANCEL(2)
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